Publication: Pion production by diffraction of W bosons in the dipole model
Loading...
Date
2011-06
Authors
Egaña Ugrinovic, Daniel
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
In this work the scattering of neutrinos off heavy nuclei by exchange of W bosons in the
color dipole model is studied, for small boson virtualities and energies of the order of some
GeV’s. The first objective of this work is to analyze the black disc limit and to compare
the results of the dipole model using perturbative light front wave functions with the ones
of the meson model, which are vanishing because of lepton current conservation. Since
both results differ, a more complete analysis is carried out, based on Glauber’s approach.
At high energies, it is known that the color dipole model is well suited to study diffractive
processes on nuclei, but at smaller energies the dipole lifetime is not large enough for the
dipole to travel through the nucleus with a frozen transverse size. The short-lived dipoles
are identified, and explicit calculations are carried out to determine if they have a large
contribution to the final cross section. Although the model presents serious problems
because of these short-lived asymmetric pairs, it provides a lower bound for the total
cross section of pion production and it gives some additional hints that could be also of
interest in more sophisticated models.
Description
Keywords
DIFFRACTION , COLOR DIPOLE MODEL , PION PRODUCTION , GLAUBER'S FORMALISM , EIKONALIZATION , BLACK DISC LIMIT , LIFETIME , LIGHT CONE WAVE FUNCTIONS